hi sweety,
there r two ways to send iq samples to dac ,one is through dds(in which only sine and cosine wave can be given as i and q ) and other is the custom iq data through the ddr .
for the second option , u need to change the dds_setup function called in the main.c file to dac_dma_setup() function(this function is defined in test.c file under the common folder).In the test.c file there is an array defined as dac_dma_data() it consists of the I0 Q0 I1 Q1 .here you can change the iq values to send the custom data.
by default the values provided in the array is for sine -I and cosine -Q .But if you want to send some other signal like some sequence as i and q then the ouput of adc is not coming correct.
as u said u have to build prototype of communication system ,wat message signal(baseband signal ) you will be giving to the dac.
mail- gitakalbhor@gmail.com or gitanjali.kalbhor@bharatforge.com. it would be better if we could talk.
thanks
gitanjali